大 sink to the bottom of water. We get stone from the 多数石头在水中沉底。我们从地面和山上 ground and from mountains. Stone does not bend, 获得石头。石头不弯曲,但是它可以被切 but it can be cut into shapes. 割成(不同的)形状。 We get metal from stone. Metals are strong 我们从石头中...
Like if you go to the store and give the cashier 5 dollars for something that costs 4 dollars 98 cents, you'll get 2 cents back, but 2 cents does not buy much. 就像你去商店,给收银员5美元,买一些花费4美元98美分的东西,你会得到2分钱找零,但2分钱买不了什么。 The value of the penny i...
Stone, metal, wood, paper and cloth are materials. We use them every day. Stone is hard, heavy material. Most stones sink to the bottom of water. We get stone from the grand and from mountains. Stone does not bend, but it can be cut into shapes. ...
Usually it refers to a device, like a metal conductor that's used to guide and direct waves. 它指的是一个像金属导体的装置,用来指引电波。 But waveguides also occur naturally. 但是,波导也会自然产生。 They make a path for radio waves to follow in our atmosphere. 它可以使无线电波按照一定途径...
Waterjet cuttingis one of the most popular metalworking process. It uses the high force of water for metal erosion and cutting. The water jet can be adjusted to any direction, making it usable for linear, non-linear, and 3-dimensional cuts. Waterjet cutting does not have thickness limits for...
Copper is an important metal and does not occur in nature in its pure form. It has excellent heat conductivity. Copper reacts with the oxygen present in the air and thus further leads to corrosion. It turns green in colour and stops corroding further. It is reddish in colour in normal fo...
What metals are used to make salt?Salt formation:Salts are made from the neutralization reaction of an acid and a base, in which the products obtained will be water and a salt.This salts will deposit at the bottom of the solution in the form of precipitation....
Metal water bottles —To clean metal water bottles, fill your water bottle with boiling water. This will help eliminate odor and mold growing inside the bottle. After allowing the water to soak for several hours or overnight, wash the inside of the bottle out thoroughly with hot, soapy water...
①You need a strong adhesive to bond wood to metal.( vt.使牢固结合) ②The team has bonded together well.(vi.增强信任关系) ③The experience created a very special bond between us.(n.纽带;关系) 三、知识要点 1.set sail...
题目22 A metal forms an oxide which dissolves in water.What is the colour observed when a few drops of Universal indicator are added to the solution? D. A. red B. green C blue D violet 相关知识点: 试题来源: 解析 D 反馈 收藏